Fundamental and descriptive units
نویسندگان
چکیده
منابع مشابه
Fundamental units: physics and metrology
The problem of fundamental units is discussed in the context of achievements of both theoretical physics and modern metrology. On one hand, due to fascinating accuracy of atomic clocks, the traditional macroscopic standards of metrology (second, metre, kilogram) are giving way to standards based on fundamental units of nature: velocity of light c and quantum of action h. On the other hand, the ...
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Ideal rods and clocks are defined as an infinitesimal symmetry of the spacetime. Since no a priori geometric structure is considered, all the possible models of spacetime are obtained.
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lthough the present International System of Units (SI, from the French Système International d’Unités) was officially established in 1960, its origin goes back to the creation of the metric system during the French Revolution. Following an idea proposed a century earlier by John Wilkins,1 the new system of weights and measures took as its starting point a single universal measure—the meter—and ...
متن کاملOn Effective Computation of Fundamental Units . I
The new method for efficient computation of the fundamental units of an algebraic number field developed by the authors in an earlier paper is considerably improved with respect to (Section 1) utilization to best advantage of the element of choice inherent in the method and the mastery of the linear programming techniques involved, (Section 2) ideal factorization, and (Section 3) the determinat...
متن کاملCross-language merged speech units and their descriptive phonetic correlates
The focus of this paper is to formulate an approach to merging phonemes across languages and to evaluate the resulting crosslanguage merged speech units on the basis of the traditional acousticphonetic descriptions of the phonemes. The methodology is based on the belief that some phonemes across a set of languages may be similar enough to be equated, contrasting traditional phonology which trea...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1987
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed064p191.2